There is massive infrastructure for analog audio.
If USB headphones were going to take off, it would have happened already. I have a gaming headset that's USB. There just isn't that much USB head audio out there.
Considering the extra cost of USB anything, I really don't see USB-C audio overtaking analog audio. Initially, the technology is going to be priced too high, and while it will get cheaper, it will never approach the cheapness of analog headphones or buds or whatever.
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